WebSVN – HelenOS-historic – Blame – /kernel/trunk/generic/src/ddi/ddi.c

Rev	Author	Line No.	Line
1178	jermar	1	/*
		2	* Copyright (C) 2006 Jakub Jermar
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
1248	jermar	28
		29	/**
		30	* @file ddi.c
		31	* @brief Device Driver Interface functions.
		32	*
		33	* This file contains functions that comprise the Device Driver Interface.
		34	* These are the functions for mapping physical memory and enabling I/O
		35	* space to tasks.
		36	*/
1178	jermar	37
		38	#include <ddi/ddi.h>
		39	#include <ddi/ddi_arg.h>
		40	#include <proc/task.h>
		41	#include <security/cap.h>
		42	#include <mm/frame.h>
		43	#include <mm/as.h>
		44	#include <synch/spinlock.h>
1288	jermar	45	#include <syscall/copy.h>
1178	jermar	46	#include <arch.h>
		47	#include <align.h>
		48	#include <errno.h>
		49
		50	/** Map piece of physical memory into virtual address space of specified task.
		51	*
		52	* @param id Task ID of the destination task.
		53	* @param pf Physical frame address of the starting frame.
		54	* @param vp Virtual page address of the starting page.
		55	* @param pages Number of pages to map.
		56	* @param writable If true, the mapping will be created writable.
		57	*
		58	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
		59	* ENOENT if there is no task matching the specified ID and ENOMEM if
		60	* there was a problem in creating address space area.
		61	*/
1227	jermar	62	static int ddi_physmem_map(task_id_t id, __address pf, __address vp, count_t pages, bool writable)
1178	jermar	63	{
		64	ipl_t ipl;
		65	cap_t caps;
		66	task_t *t;
		67	int flags;
		68	count_t i;
		69
		70	/*
		71	* Make sure the caller is authorised to make this syscall.
		72	*/
		73	caps = cap_get(TASK);
		74	if (!(caps & CAP_MEM_MANAGER))
		75	return EPERM;
		76
		77	ipl = interrupts_disable();
		78	spinlock_lock(&tasks_lock);
		79
		80	t = task_find_by_id(id);
		81
		82	if (!t) {
		83	/*
		84	* There is no task with the specified ID.
		85	*/
		86	spinlock_unlock(&tasks_lock);
		87	interrupts_restore(ipl);
		88	return ENOENT;
		89	}
		90
		91	/*
		92	* TODO: We are currently lacking support for task destroying.
		93	* Once it is added to the kernel, we must take care to
		94	* synchronize in a way that prevents race conditions here.
		95	*/
		96
		97	/* Lock the task and release the lock protecting tasks_btree. */
		98	spinlock_lock(&t->lock);
		99	spinlock_unlock(&tasks_lock);
		100
		101	flags = AS_AREA_DEVICE \| AS_AREA_READ;
		102	if (writable)
		103	flags \|= AS_AREA_WRITE;
1239	jermar	104	if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE)) {
1178	jermar	105	/*
		106	* The address space area could not have been created.
		107	* We report it using ENOMEM.
		108	*/
		109	spinlock_unlock(&t->lock);
		110	interrupts_restore(ipl);
		111	return ENOMEM;
		112	}
		113
		114	/* Initialize page tables. */
		115	for (i = 0; i < pages; i++)
		116	as_set_mapping(t->as, vp + i * PAGE_SIZE, pf + i * FRAME_SIZE);
		117
		118	spinlock_unlock(&t->lock);
		119	interrupts_restore(ipl);
		120	return 0;
		121	}
		122
1191	jermar	123	/** Enable range of I/O space for task.
		124	*
		125	* @param id Task ID of the destination task.
		126	* @param ioaddr Starting I/O address.
		127	* @param size Size of the enabled I/O space..
		128	*
		129	* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
		130	* ENOENT if there is no task matching the specified ID.
		131	*/
1227	jermar	132	static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size)
1191	jermar	133	{
		134	ipl_t ipl;
		135	cap_t caps;
		136	task_t *t;
		137	int rc;
		138
		139	/*
		140	* Make sure the caller is authorised to make this syscall.
		141	*/
		142	caps = cap_get(TASK);
		143	if (!(caps & CAP_IO_MANAGER))
		144	return EPERM;
		145
		146	ipl = interrupts_disable();
		147	spinlock_lock(&tasks_lock);
		148
		149	t = task_find_by_id(id);
		150
		151	if (!t) {
		152	/*
		153	* There is no task with the specified ID.
		154	*/
		155	spinlock_unlock(&tasks_lock);
		156	interrupts_restore(ipl);
		157	return ENOENT;
		158	}
		159
		160	/*
		161	* TODO: We are currently lacking support for task destroying.
		162	* Once it is added to the kernel, we must take care to
		163	* synchronize in a way that prevents race conditions here.
		164	*/
		165
		166	/* Lock the task and release the lock protecting tasks_btree. */
		167	spinlock_lock(&t->lock);
		168	spinlock_unlock(&tasks_lock);
		169
1227	jermar	170	rc = ddi_iospace_enable_arch(t, ioaddr, size);
1191	jermar	171
		172	spinlock_unlock(&t->lock);
		173	interrupts_restore(ipl);
		174	return rc;
		175	}
		176
1178	jermar	177	/** Wrapper for SYS_MAP_PHYSMEM syscall.
		178	*
1191	jermar	179	* @param User space address of memory DDI argument structure.
1178	jermar	180	*
		181	* @return 0 on success, otherwise it returns error code found in errno.h
		182	*/
1227	jermar	183	__native sys_physmem_map(ddi_memarg_t *uspace_mem_arg)
1178	jermar	184	{
1191	jermar	185	ddi_memarg_t arg;
1288	jermar	186	int rc;
1178	jermar	187
1288	jermar	188	rc = copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t));
		189	if (rc != 0)
		190	return (__native) rc;
		191
1227	jermar	192	return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE),
1178	jermar	193	ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages,
		194	(bool) arg.writable);
		195	}
1191	jermar	196
		197	/** Wrapper for SYS_ENABLE_IOSPACE syscall.
		198	*
		199	* @param User space address of DDI argument structure.
		200	*
		201	* @return 0 on success, otherwise it returns error code found in errno.h
		202	*/
1227	jermar	203	__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
1191	jermar	204	{
		205	ddi_ioarg_t arg;
1288	jermar	206	int rc;
1191	jermar	207
1288	jermar	208	rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
		209	if (rc != 0)
		210	return (__native) rc;
		211
1227	jermar	212	return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size);
1191	jermar	213	}

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